CN104269882A - Energy feedback unit and energy feedback method - Google Patents
Energy feedback unit and energy feedback method Download PDFInfo
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- CN104269882A CN104269882A CN201410495869.8A CN201410495869A CN104269882A CN 104269882 A CN104269882 A CN 104269882A CN 201410495869 A CN201410495869 A CN 201410495869A CN 104269882 A CN104269882 A CN 104269882A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
- H02J3/44—Synchronising a generator for connection to a network or to another generator with means for ensuring correct phase sequence
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Abstract
The invention discloses an energy feedback unit and an energy feedback method. The energy feedback unit comprises a three-phase input wire voltage sampling module, a current sampling module, a busbar voltage sampling module and a control module, wherein the three-phase input wire voltage sampling module is used for sampling the voltage of a power grid and transmitting the voltage to the control module, the current sampling module is used for sampling the current of the power grid and transmitting the current to the control module, the busbar voltage sampling module is used for sampling the busbar side voltage of the energy feedback unit and transmitting the busbar side voltage to the control module, and the control module is used for performing an automatic phase distinguishing and locking algorithm according to a signal transmitted by the three-phase input wire voltage sampling module and performing a double-closed-loop control algorithm and a zero sequence current compensation control algorithm according to signals transmitted by the current sampling module and the busbar voltage sampling module so as to generate a PWM driving signal for driving a first inverter bridge. The energy feedback unit and the energy feedback method have the advantages that the zero sequence current compensation algorithm is adopted for eliminating loop current, the power supply reliability is improved, the phase position of power grids can be automatically identified, and indifference grid connection is achieved.
Description
Technical field
The present invention relates to technical field of electric power, more particularly, relate to a kind of energy feedback unit and energy feedback method.
Background technology
Along with national energy-saving reduces discharging constantly improving of policy and constantly perfecting of legal system, energy-conserving and environment-protective idea is rooted in the hearts of the people, frequency converter is as the product of Development of Power Electronic Technology, be widely used in every field such as the industries such as metallurgy, petrochemical industry, running water, electric power of national economy, and play more and more important effect.Frequency converter be utilize semiconductor power device turn on and off the electrical energy changer that power frequency supply to be transformed to frequency-adjustable by effect.This device is first is direct current the transformation of electrical energy of AC power, then is that the alternating current of changeable frequency is to drive load DC power conversion.
For the frequency converter of occasion being applied to motor braking, generally adopt resistance energy-consumption braking mode.Although the method is simple, there is shortcomings such as wasting energy, efficiency is low, resistance heating is serious, other parts of influential system normally work.
In recent years, the application of energy feedback unit was more and more extensive, and energy feedback unit is mainly divided into tandem energy feedback unit and parallel type energy feedback unit.Although tandem energy feedback unit is conducive to increasing improve power factor, the runnability of raising system, and energy feedback can be realized to electrical network, but cost is higher, function singleness, add some products very high to the requirement of electrical network, be not suitable for the national conditions of China.
Parallel type energy feedback unit, as the ancillary equipment of frequency converter, is parallel to the DC side of frequency converter, by the Way of Regenerating Energy Feedback of motor braking to electrical network.
Parallel type energy feedback unit need not change the system configuration of frequency converter, can use, be therefore very applicable to China's national situation as a brake unit.Because parallel type energy feedback unit is in parallel with frequency converter bus, inputting in parallel with power supply, easily there is loop current in traditional double-closed-loop control, causes the distortion of line voltage and feedback current.On the other hand, parallel type energy feedback unit in use by energy feedback to electrical network, traditional electric energy meter cannot realize the measurement of reverse current, therefore cannot Measurement accuracy for feedback electricity.
Summary of the invention
The technical problem to be solved in the present invention is, the defect of loop current easily appears in the above-mentioned double-closed-loop control for prior art, provides a kind of energy feedback unit and energy feedback method.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of energy feedback unit, in parallel with frequency converter, described energy feedback unit comprises filter circuit, the first inverter bridge, first inverter bridge is used for the voltage between the DC bus of frequency converter to carry out inversion, and filter circuit is used for the high order harmonic component in the grid-connected current after filtering inversion thus is filtered into sinusoidal wave and inject electrical network; It is characterized in that, also comprise: control module, three-phase input line voltage sampling module, current sample module and busbar voltage sampling module;
Three-phase input line voltage sampling module is used for carrying out voltage sample to electrical network, and after carrying out signal condition, line voltage is converted to the acceptable voltage range of control module, and sends control module to;
Current sample module is used for carrying out current sample to electrical network, and after carrying out filtering conditioning, sends control module to;
Busbar voltage sampling module is used for sampling to the bus bar side voltage of energy feedback unit, and sends control module to after nursing one's health after filtering;
Control module is used for the signal transmitted according to three-phase input line voltage sampling module, carry out phase place automatic identification, automatically phase locked algorithm, and the signal for transmitting according to current sample module and busbar voltage sampling module, carry out double-closed-loop control algorithm and zero sequence current compensation control algolithm, to produce the PWM drive singal driving described first inverter bridge.
Preferably, current sample module comprises the adder, scaling circuit and the modulate circuit that connect successively, also comprises three the current Hall transducers be all connected with adder;
Modulate circuit is connected with control module; Current Hall transducer is for power network current of sampling.
Preferably, described control module is also for according to formula
calculate active power, and the active power time of being multiplied by obtained is obtained the total electricity feeding back to electrical network, wherein, P is active power, and U is line voltage, and I is line current,
for the power factor of system.
Preferably, described phase place automatic identification algorithm comprises:
To sampling, the three-phase voltage obtained carries out phase-locked in advance; Judge phase sequence, if judged result is negative-phase sequence, then exchange sampled result U
bCand U
cA, and perform phase locked algorithm; If judged result is not negative-phase sequence, then not excute phase adjustment, and process ends.
Preferably, described first inverter bridge comprises three-phase brachium pontis, and described three-phase brachium pontis is made up of six power switch pipes; Described first inverter bridge is used for the direct voltage between the DC bus of frequency converter to be reverse into alternating voltage.
Preferably, described filter circuit comprises three inductance.
On the other hand, a kind of energy feedback method is provided, comprises the following steps:
Voltage sample is carried out to electrical network, and carries out filtering conditioning;
Current sample is carried out to electrical network, and carries out filtering conditioning;
The bus bar side voltage of energy feedback unit is sampled, and carries out filtering conditioning;
According to the line voltage obtained of sampling, carry out phase place automatic identification and automatic phase locked algorithm;
According to current sample and voltage sample result, carry out double-closed-loop control algorithm and zero sequence current compensation control algolithm, to produce the drive singal of driving first inverter bridge PWM.
Preferably, described according to the line voltage obtained of sampling, carry out automatic phase locked algorithm and comprise:
By the three-phase electricity netting twine voltage U obtained of sampling
aB, U
bC, U
cAcarry out line voltage phase locked algorithm, make grid-connected current phase place follow the tracks of electric network voltage phase all the time by phase-locked loop;
Adopt pi regulator control bus voltage, busbar voltage is stable at the magnitude of voltage V of setting
dc.
Preferably, described double-closed-loop control algorithm comprises the following steps:
By busbar voltage reference value V
dc-refwith busbar voltage V
dcafter adder, through pi regulator, obtain the reference value i of active current
d_ref;
To sample and the power network current i obtained after filtering conditioning
a, i
b, i
cafter three-phase to two phase inversion, then under transforming to dq coordinate system by two-phase, obtain current i
d, i
q;
The idle component i of given electric current
q_refreference value be 0, by i
q_refand i
qafter adder and pi regulator, with current i
dcomponent of voltage V is obtained after the current coupling amount of q axle is added
d, wherein, the current component i on d axle
dcurrent coupling amount on q axle is+ω Li
d;
By i
d_refwith i
dbe added by adder, the signal after addition regulates through pi regulator, by the coupling amount of the voltage after pi regulator, q shaft current and line voltage real component U
dbe added by adder and obtain component of voltage V
q, wherein, the current component i on q axle
qcoupling amount on d axle is+ω Li
q.
Preferably, described zero sequence current compensation control algolithm comprises: by the actual value i of zero-sequence current
0with 0 through adder, and obtain component of voltage V after pi regulator regulates
0;
By component of voltage V
d, V
qand V
0after the conversion that dq0 coordinate is tied to α β 0 coordinate system, obtain V
α, V
β, V
0, then carry out space vector modulation, obtain the PWM drive singal of driving first inverter bridge;
Wherein,
i
a, i
band i
cfor the power network current obtained by current Hall sensor sample.
Implement a kind of energy feedback unit of the present invention and energy feedback method, there is following beneficial effect: eliminate circulation by adopting zero sequence current compensation method, improve power supply reliability, and the function of electric energy meter can be realized, the electricity feeding back to electrical network can be calculated accurately; By the sampling of three-phase input line voltage and the sampling of three-phase current, the phase place automatically differentiating electrical network can be realized, realize indifference grid-connected; Realize parallel type energy feedback unit safety, reliably, in parallelly with frequency converter easily to use; Fast feedback can be realized, the circulation problem of traditional parallel type energy feedback unit can be solved, and the phase problem of access electrical network need not be scrupled, use convenient, reliable.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the energy feedback unit of the embodiment of the present invention and the connecting circuit figure of frequency converter;
Fig. 2 is the structured flowchart of the energy feedback unit of the embodiment of the present invention;
Fig. 3 is double-closed-loop control algorithm and the zero sequence current compensation control algolithm schematic diagram of the control module of the embodiment of the present invention;
Fig. 4 is the flow chart of the phase place automatic identification of the embodiment of the present invention;
Fig. 5 is the structured flowchart of the current sample module of the embodiment of the present invention.
Fig. 6 is the flow chart of the energy feedback method of the embodiment of the present invention.
Embodiment
In order to there be understanding clearly to technical characteristic of the present invention, object and effect, now contrast accompanying drawing and describe the specific embodiment of the present invention in detail.
The parallel type energy feedback unit of the embodiment of the present invention, is applied to motor braking occasion, in parallelly with frequency converter uses.The parallel type energy feedback unit of the embodiment of the present invention and energy feedback method, by adopting zero sequence current compensation method to eliminate circulation, improving power supply reliability, and can realize the function of electric energy meter, can calculate the electricity feeding back to electrical network accurately; By the sampling of three-phase input line voltage and the sampling of three-phase current, the phase place automatically differentiating electrical network can be realized, realize indifference grid-connected.
See Fig. 1, be the energy feedback unit of the embodiment of the present invention and the connecting circuit figure of frequency converter.DC bus P (+) end of frequency converter is held with the DC+ of energy feedback unit and is connected, and DC bus N (-) end of frequency converter is held with the DC-of energy feedback unit and is connected.Energy feedback unit comprise filter circuit 2, first inverter bridge 1 and be parallel to DC+ end with DC-end between electric capacity C3 and electric capacity C4.Filter circuit 2 is connected with electrical network 10.Frequency converter is existing universal frequency converter, and it comprises diode rectifier bridge (being made up of D1 ~ D6), large bulk capacitance C1, C2 and the second inverter bridge.Motor 20 is connected to the output of the second inverter bridge.
When motor 20 electric operation, the electronic supply access be made up of diode rectifier bridge, large bulk capacitance and the second inverter bridge provides electric energy to motor 20.When motor 20 brakes (slowing down or potential energy release), the voltage between the DC bus of frequency converter can sharply rise, and the energy that motor 20 regenerates pours between the DC bus of energy feedback unit.When energy feedback unit detects that voltage between DC bus is higher than predetermined value, control the working method of the first inverter bridge 1, the voltage between DC bus is carried out inversion, after filter circuit 2, become near sinusoidal ripple electric current and inject R, S, T end of electrical network 10.High order harmonic component in filter circuit 2 (being made up of inductance L 1, L2 with the L3) grid-connected current after filtering inversion thus filtered into sinusoidal wave and inject electrical network, can effectively improve the current quality feeding back to electrical network.In the embodiment of the present invention, inverter bridge 1 is the three-phase brachium pontis be made up of power switch pipe T1-T6, for direct voltage is reverse into alternating voltage.
T1 ~ T6 carry out PWM open with turn off while, line voltage forms circulation through the T1 ~ T6 of the input side diode rectifier bridge D1 ~ D6 of frequency converter and energy feedback unit.The energy feedback unit of the embodiment of the present invention eliminates circulation by adopting zero sequence current compensation method, improves power supply reliability, refers to the description that follow-up composition graphs 2 ~ Fig. 5 carries out.
See Fig. 2, the energy feedback unit of the embodiment of the present invention also comprises control module 3, three-phase input line voltage sampling module 4, current sample module 5 and busbar voltage sampling module 6.Three-phase input line voltage sampling module 4 is held with R, S, T of electrical network and is connected, and is connected with control module 3.Current sample module 5 is held with R, S, T of electrical network and is connected, and is connected with control module 3.Busbar voltage sampling module 6 is connected with the DC bus side of energy feedback unit, and is connected with control module 3.
Three-phase input line voltage sampling module 4 is for carrying out voltage (U to electrical network
aB, U
bC, U
cA) sampling, and after carrying out signal condition, line voltage is converted to the acceptable voltage range of control module 3, and sends control module 3 to.
Current sample module 5 for carrying out current sample to electrical network, and after carrying out filtering conditioning, transfer control module 3.See Fig. 5, current sample module 5 comprises three current Hall transducers 41 ~ 43, adder 44, scaling circuit 45 and modulate circuit 46.After current Hall transducer 41 ~ 43 sampling power network current, the electric current of sampling obtains the instantaneous value of zero-sequence current after adder 44, after scaling circuit 45 and modulate circuit 46, be converted to the acceptable voltage range of control module 3 again, and send control module 3 to.
Busbar voltage sampling module 6 for sampling to the bus bar side voltage of energy feedback unit, and sends control module 3 to, to carry out busbar voltage control algolithm after nursing one's health after filtering.
The signal of control module 3 for transmitting according to three-phase input line voltage sampling module 4, carry out phase place automatic identification, automatically phase locked algorithm, and the signal for transmitting according to current sample module 5 and busbar voltage sampling module 6, carry out double-closed-loop control algorithm and zero sequence current compensation control algolithm, to produce the PWM drive singal of driving first inverter bridge.In the embodiment of the present invention, by automatic identification, automatically phase locked algorithm, double-closed-loop control algorithm and zero sequence current compensation algorithm, make busbar voltage be stable at set point, ensure that frequency converter normally runs.By the algorithm of zero sequence current compensation, the circulation controlled between the first inverter bridge and frequency converter is 0 substantially, avoids circulation and impacts the stability of a system, avoid polluting electrical network, reduce noise.
It is the flow chart of the phase place automatic identification of the embodiment of the present invention see Fig. 4.Control module 3 is according to the signal received, and carry out phase place automatic identification, automatic locking phase scheduling algorithm, thus, when phase place connects anti-, energy back unit still can normally run.Wherein, step S1 adopts module 4 to realize by three-phase input line voltage.Step S2 ~ S6 is realized by control module 3.In step s 2, carry out phase-locked in advance to the three-phase voltage obtained of sampling; Judge phase sequence in step s3, if judged result is negative-phase sequence in step S4, then exchange sampled result U in step s 5
bCand U
cA, and perform phase locked algorithm in step s 6.If judged result is not negative-phase sequence in step S4, then not excute phase adjustment, process ends.
Concrete, the line voltage that control module 3 obtains according to sampling carries out automatic phase locked algorithm and comprises: by the three-phase electricity netting twine voltage U obtained of sampling
aB, U
bC, U
cAcarry out line voltage phase locked algorithm, make grid-connected current phase place follow the tracks of electric network voltage phase all the time by phase-locked loop; Adopt pi regulator control bus voltage, busbar voltage is stable at the magnitude of voltage V of setting
dc.
See the schematic diagram that Fig. 3 is double-closed-loop control principle and zero sequence current compensation principle.
In embodiments of the present invention, outer shroud adopts DC bus-bar voltage ring, adopts pi regulator, busbar voltage is stable at the magnitude of voltage of setting.Electric current loop adopts i
d, i
q, i
0the pattern of three electric current loop parallel connections, all adopts pi regulator, can realize non differential regulation, and can reach good dynamic property and stable state accuracy.
See Fig. 3, the double-closed-loop control algorithm of the embodiment of the present invention comprises:
By busbar voltage reference value V
dc-refwith busbar voltage V
dcafter adder, through pi regulator, obtain the reference value i of active current
d_ref;
To sample and the power network current i obtained after filtering conditioning
a, i
b, i
cafter three-phase (a/b/c) to two-phase (α/β) conversion, then under transforming to dq coordinate system by two-phase (α/β), obtain current i
d, i
q;
The idle component i of given electric current
q_refreference value be 0, by i
q_refand i
qafter adder and pi regulator, with current i
dcomponent of voltage V is obtained after the current coupling amount of q axle is added
d, wherein, the current component i on d axle
dcurrent coupling amount on q axle is+ω Li
d;
By i
d_refwith i
dbe added by adder, the signal after addition regulates through pi regulator, by the coupling amount of the voltage after pi regulator, q shaft current and line voltage real component U
dbe added by adder and obtain component of voltage V
q, wherein, the current component i on q axle
qcoupling amount on d axle is+ω Li
q.
See Fig. 3, the implementation method of control module 3 zero sequence current compensation method is through adder by three-phase current, convert the zero-sequence current component of each phase of three-phase ABC to, then adopt zero-sequence current injection method that zero-sequence component is injected control ring, realize zero sequence current compensation, eliminate the circulation problem under application model in parallel.Concrete, the principle that realizes of zero sequence current compensation is: the electric current that the frequency converter in parallel with energy feedback unit flows through can regard the zero-sequence current of energy feedback unit as, namely
i
a, i
band i
cfor the power network current obtained by current Hall sensor sample, control i
0=0, the circulation produced when energy feedback unit just can be suppressed in parallel with frequency converter.Because the control of circulation is very high to the dynamic performance requirements of system, therefore addition section is completed (see Fig. 5) by hardware, directly produces the actual value i of zero-sequence current
0.By the actual value i of zero-sequence current
0with 0 through adder, and obtain component of voltage V after pi regulator regulates
0; By component of voltage V
d, V
qand V
0after the conversion that dq0 coordinate is tied to α β 0 coordinate system, obtain V
α, V
β, V
0, then carry out space vector modulation, obtain the PWM drive singal of driving first inverter bridge, thus drive T1 ~ T6 that the voltage between DC bus is carried out inversion, after filter circuit 2, become near sinusoidal ripple electric current after inversion and inject R, S, T end of electrical network 10.
Thus, when external energy makes busbar voltage be increased to set point, control module 3 is by control algolithm as shown in Figure 3, control the working method of the first inverter bridge 1, voltage between DC bus is carried out inversion, after filter circuit 2, become near sinusoidal ripple electric current and inject R, S, T end of electrical network 10, busbar voltage is stabilized in below preset value, and busbar voltage ring exports given as active current.Thus, can circulation be eliminated, improve power supply reliability.
In addition, in the embodiment of the present invention, control module 3 is also for according to formula
calculate active power, and the active power time of being multiplied by obtained is obtained the total electricity feeding back to electrical network, wherein, P is active power, and U is line voltage, and I is line current,
for the power factor of system.Line voltage U, line current I can obtain according to the sampled result of three-phase input line voltage sampling module 4 and current sample module 5.
Be the flow chart of the energy feedback method of the embodiment of the present invention see Fig. 6, the method comprises the following steps:
S10, voltage sample is carried out to electrical network, and carry out filtering conditioning;
S11, current sample is carried out to electrical network, and carry out filtering conditioning;
S12, the bus bar side voltage of energy feedback unit to be sampled, and carry out filtering conditioning;
S13, the line voltage obtained according to sampling, carry out phase place automatic identification and automatic phase locked algorithm;
S14, according to current sample and voltage sample result, carry out double-closed-loop control algorithm and zero sequence current compensation control algolithm, to produce the drive singal of driving first inverter bridge PWM.
According to the line voltage obtained of sampling, carry out automatic phase locked algorithm and comprise:
By the three-phase electricity netting twine voltage U obtained of sampling
aB, U
bC, U
cAcarry out line voltage phase locked algorithm, make grid-connected current phase place follow the tracks of electric network voltage phase all the time by phase-locked loop;
Adopt pi regulator control bus voltage, busbar voltage is stable at the magnitude of voltage V of setting
dc.
Double-closed-loop control algorithm comprises the following steps:
By busbar voltage reference value V
dc-refwith busbar voltage V
dcafter adder, through pi regulator, obtain the reference value i of active current
d_ref;
To sample and the power network current i obtained after filtering conditioning
a, i
b, i
cafter three-phase (a/b/c) to two-phase (α/β) conversion, then under transforming to dq coordinate system by two-phase (α/β), obtain current i
d, i
q;
The idle component i of given electric current
q_refreference value be 0, by i
q_refand i
qafter adder and pi regulator, with current i
dcomponent of voltage V is obtained after the current coupling amount of q axle is added
d, wherein, the current component i on d axle
dcurrent coupling amount on q axle is+ω Li
d;
By i
d_refwith i
dbe added by adder, the signal after addition regulates through pi regulator, by the coupling amount of the voltage after pi regulator, q shaft current and line voltage real component U
dbe added by adder and obtain component of voltage V
q, wherein, the current component i on q axle
qcoupling amount on d axle is+ω Li
q.
Zero sequence current compensation control algolithm comprises: by the actual value i of zero-sequence current
0with 0 through adder, and obtain component of voltage V after pi regulator regulates
0;
By component of voltage V
d, V
qand V
0after the conversion that dq0 coordinate is tied to α β 0 coordinate system, obtain V
α, V
β, V
0, then carry out space vector modulation (SVPWM), obtain the PWM drive singal of driving first inverter bridge; Wherein,
i
a, i
band i
cfor the power network current obtained by current Hall sensor sample.
Should understand, method and the above-mentioned energy feedback unit of the embodiment of the present invention are corresponding, its current sample, busbar voltage sampling etc. can be realized by above-mentioned current sample module 5, busbar voltage sampling module 6, its double-closed-loop control algorithm and zero sequence current compensation control algolithm with reference to foregoing description, can not repeat them here.
The energy feedback unit of the embodiment of the present invention, with frequency converter in parallel uses, have employed the double-closed-loop control algorithm of zero sequence current compensation, effectively can eliminate the circulation between energy feedback unit and frequency converter, have safe, reliable, the advantages such as efficiency is high, noiseless, line voltage phase sequence automatic identification can be realized, use convenient, adopt AC reactor, can direct grid-connected feedback, without the need to using other adjunct circuits.The parallel type energy feedback unit of the embodiment of the present invention, can be applicable to the application scenario of the frequency converter needing motor braking, or wind energy, distributed solar power generation application.
By reference to the accompanying drawings embodiments of the invention are described above; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; instead of it is restrictive; those of ordinary skill in the art is under enlightenment of the present invention; do not departing under the ambit that present inventive concept and claim protect, also can make a lot of form, these all belong within protection of the present invention.
Claims (10)
1. an energy feedback unit, in parallel with frequency converter, described energy feedback unit comprises filter circuit (2), the first inverter bridge (1), first inverter bridge (1) is for carrying out inversion by the voltage between the DC bus of frequency converter, and filter circuit (2) is for the high order harmonic component in the grid-connected current after filtering inversion thus filtered into sinusoidal wave and inject electrical network; It is characterized in that, also comprise: control module (3), three-phase input line voltage sampling module (4), current sample module (5) and busbar voltage sampling module (6);
Line voltage for carrying out voltage sample to electrical network, and after carrying out signal condition, is converted to control module (3) acceptable voltage range by three-phase input line voltage sampling module (4), and sends control module (3) to;
Current sample module (5) for carrying out current sample to electrical network, and after carrying out filtering conditioning, sends control module (3) to;
Busbar voltage sampling module (6) for sampling to the bus bar side voltage of energy feedback unit, and sends control module (3) to after nursing one's health after filtering;
The signal of control module (3) for transmitting according to three-phase input line voltage sampling module (4), carry out phase place automatic identification, automatically phase locked algorithm, and the signal for transmitting according to current sample module (5) and busbar voltage sampling module (6), carry out double-closed-loop control algorithm and zero sequence current compensation control algolithm, to produce the PWM drive singal driving described first inverter bridge.
2. energy feedback unit according to claim 1, it is characterized in that, current sample module (5) comprises the adder (44), scaling circuit (45) and the modulate circuit (46) that connect successively, also comprises three the current Hall transducers (41,42,43) be all connected with adder;
Modulate circuit (46) is connected with control module (3); Current Hall transducer (41,42,43) is for power network current of sampling.
3. energy feedback unit according to claim 1, is characterized in that, described control module (3) is also for according to formula
calculate active power, and the active power time of being multiplied by obtained is obtained the total electricity feeding back to electrical network, wherein, P is active power, and U is line voltage, and I is line current,
for the power factor of system.
4. energy feedback unit according to claim 1, is characterized in that, described phase place automatic identification algorithm comprises:
To sampling, the three-phase voltage obtained carries out phase-locked in advance; Judge phase sequence, if judged result is negative-phase sequence, then exchange sampled result U
bCand U
cA, and perform phase locked algorithm; If judged result is not negative-phase sequence, then not excute phase adjustment, and process ends.
5. energy feedback unit according to claim 1, is characterized in that, described first inverter bridge (1) comprises three-phase brachium pontis, and described three-phase brachium pontis is made up of six power switch pipes; Described first inverter bridge (1) is for being reverse into alternating voltage by the direct voltage between the DC bus of frequency converter.
6. energy feedback unit according to claim 1, is characterized in that, described filter circuit comprises three inductance (L1, L2, L3).
7. an energy feedback method, is characterized in that, comprises the following steps:
Voltage sample is carried out to electrical network, and carries out filtering conditioning;
Current sample is carried out to electrical network, and carries out filtering conditioning;
The bus bar side voltage of energy feedback unit is sampled, and carries out filtering conditioning;
According to the line voltage obtained of sampling, carry out phase place automatic identification and automatic phase locked algorithm;
According to current sample and voltage sample result, carry out double-closed-loop control algorithm and zero sequence current compensation control algolithm, to produce the drive singal of driving first inverter bridge PWM.
8. energy feedback method according to claim 7, is characterized in that, described according to the line voltage obtained of sampling, and carries out automatic phase locked algorithm and comprises:
By the three-phase electricity netting twine voltage U obtained of sampling
aB, U
bC, U
cAcarry out line voltage phase locked algorithm, make grid-connected current phase place follow the tracks of electric network voltage phase all the time by phase-locked loop;
Adopt pi regulator control bus voltage, busbar voltage is stable at the magnitude of voltage V of setting
dc.
9. energy feedback method according to claim 8, is characterized in that, described double-closed-loop control algorithm comprises the following steps:
By busbar voltage reference value V
dc-refwith busbar voltage V
dcafter adder, through pi regulator, obtain the reference value i of active current
d_ref;
To sample and the power network current i obtained after filtering conditioning
a, i
b, i
cafter three-phase to two phase inversion, then under transforming to dq coordinate system by two-phase, obtain current i
d, i
q;
The idle component i of given electric current
q_refreference value be 0, by i
q_refand i
qafter adder and pi regulator, with current i
dcomponent of voltage V is obtained after the current coupling amount of q axle is added
d, wherein, the current component i on d axle
dcurrent coupling amount on q axle is+ω Li
d;
By i
d_refwith i
dbe added by adder, the signal after addition regulates through pi regulator, by the coupling amount of the voltage after pi regulator, q shaft current and line voltage real component U
dbe added by adder and obtain component of voltage V
q, wherein, the current component i on q axle
qcoupling amount on d axle is+ω Li
q.
10. energy feedback method according to claim 9, is characterized in that, described zero sequence current compensation control algolithm comprises: by the actual value i of zero-sequence current
0with 0 through adder, and obtain component of voltage V after pi regulator regulates
0;
By component of voltage V
d, V
qand V
0after the conversion that dq0 coordinate is tied to α β 0 coordinate system, obtain V
α, V
β, V
0, then carry out space vector modulation, obtain the PWM drive singal of driving first inverter bridge;
Wherein,
i
a, i
band i
cfor the power network current obtained by current Hall sensor sample.
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